It's Always Sunny in Philadelphia

The series follows a group of self-centered, heavy-drinking, narcissistic misfits, referred to as "The Gang", who run a dirty, unsuccessful Irish bar called Paddy's Pub in the neighborhood of South Philadelphia. In season one, The Gang consists of janitor Charlie Kelly (Charlie Day), bouncer Mac (Rob McElhenney), and bartender Dennis Reynolds (Glenn Howerton), the three of whom own Paddy's Pub, in addition to Dennis' twin sister Dee Reynolds (Kaitlin Olson), a struggling actress who works as a waitress there. In the second season, they are joined by Frank Reynolds (Danny DeVito), an eccentric multi-millionaire and the neglectful father of the Reynolds twins, who takes over most of the ownership of the bar. He soon becomes the financial catalyst for the Gang, often funding many of the Gang's over-complicated plots, while simultaneously succumbing to the brazen depravity of the group.

Each member of The Gang exhibits unethical behavior and anti-social traits such as racism, misogyny, ableism, homophobia, transphobia, antisemitism, extreme selfishness and lack of regard for others, pathological dishonesty, narcissism, constant superficiality, physical aggression, blatant disregard for the law, excessive drinking and substance abuse, unregulated emotions, cruelty, greed, envy, manipulative and predatory tendencies, apathy toward suffering, contempt for others and a lack of remorse.

At the same time, The Gang also displays acute codependency, stupidity, enabling behaviors, and a lack of awareness of basic social norms. The comedy of the show emerges from these extreme character traits resulting in conflicts that lead The Gang into absurd, dark, and painfully embarrassing situations, typically ending with them getting their comeuppance, but never learning their lesson. This allows the show to mine a variety of socio-political and economic issues for satire and dark humor while keeping the characters in a state of relative stasis conducive to the long-running sitcom format.

Episodes usually find The Gang hatching elaborate schemes and regularly conspiring, against both outsiders and one another, for personal gain, revenge, or simply schadenfreude. They habitually inflict physical and psychological pain on anyone who crosses their path, even each other, yet always return to the status quo at Paddy's Pub because they have alienated the rest of society and have only each other's company in the end.

Some of the subjects covered for the purpose of satire on the show include religion, masculinity, classism and income inequality, sexual coercion, stalking, racism, misogyny, child sex abuse, substance abuse, homophobia, transphobia, blackmail, blackface, cults, gun violence, abortion rights, underage drinking, climate change, torture, police brutality and economic recession. The show also satirizes lighter topics such as social norms, using the Gang's stupidity as a vehicle to poke fun at conventions.

Class and class conflict is a recurring theme throughout the show as Mac and Charlie are shown to be lower class whereas Dennis and Dee come from an upper class background, even if they are no longer upper class. Frank, who comes originally from a working class background, is a multi-millionaire and is frequently shown getting away with his exploitative business schemes, including shell companies for tax evasion and sweatshops in developing countries.

Sunny also frequently engages in absurd and meta humor, pulling from a variety of television, film, theatre and musical references. Some episodes see the Gang in different settings or genres or even time periods.

The main characters of Sunny exhibit no growth except to devolve and become worse people over time, as a result of only being surrounded by like-minded narcissists who all encourage the worst aspects of each others' personalities. There are no moments of sentimentality or pathos, except the rare moment when the show reveals The Gang for how truly pathetic they are.

{{More citations needed section|date=November 2024}}{{Main|List of It's Always Sunny in Philadelphia characters}}

The show features a core cast of five characters (The Gang) and a recurring cast of colorful side characters, including the Waitress, Cricket, the McPoyles, the Ponderosas, the Lawyer and various family members like Mrs. Kelly, Mrs. Mac and Uncle Jack Kelly, who cross paths and interact with the Gang in increasingly unhinged ways as the show progresses.

File:Rob McElhenney, Glenn Howerton, Charlie Day, Kaitlin Olson & Danny DeVito (9365854954).jpg

• Charlie Day as Charlie Kelly, co-owner and janitor of Paddy's Pub.
  Charlie is a childhood friend of Mac, and high school friend of Dennis and Dee. He lives in squalor with Frank, as his roommate and pseudo-father, in a run-down, vermin-infested apartment, where they share a bed. Charlie has deep-seated psychological problems, partly due to frequent substance abuse, and partly due to his complicated family background, possibly involving child abuse. He has an extensive history of pica and regularly eats various items not meant for human consumption, such as cat food, stickers, paint, and bleach. Due to his general stupidity, ignorance of social norms and illiteracy, Charlie is generally regarded as the stupidest member of The Gang. Despite this, Charlie is a naturally gifted musician, a self-proclaimed expert in "bird law" and possibly the only competent worker at Paddy's, besides Dennis, with his knack for unorthodox maintenance practices ("Charlie Work"). He also has an unhealthy obsession with "The Waitress", a recurring character who finds his interest in her creepy.
• Glenn Howerton as Dennis Reynolds, co-owner and the main bartender of Paddy's Pub, in addition to being Dee's twin brother and Frank's son.
  Seemingly the most intelligent and normal of the three co-owners, Dennis is slowly revealed to be the most narcissistic and sociopathic of The Gang. Dennis is extremely insecure, self-centered and vain and overly concerned with the people around him buying into an image of him as intelligent, cultured, attractive and of high status and class. At his most delusional, he refers to himself as a "Golden God" and flies into fits of rage when he fears he is being disrespected. Dennis' vanity is partly fed by his roommate and best friend Mac, who is in love with him, and is hinted to be a result of his mother preferring him to his twin sister Dee. Dennis' predatory nature is often depicted through numerous schemes to seduce women, typically much younger than him. It is strongly hinted at times that Dennis may secretly be a serial killer, though this remains ambiguous as a running gag.{{cite web |url=https://uproxx.com/tv/dennis-serial-killer-its-always-sunny-in-philadelphia/ |title='It's Always Sunny In Philadelphia' Will (Probably) Never Answer Whether Dennis Is A Serial Killer |website=Uproxx |first=Josh |last=Kurp |date=September 20, 2019 |access-date=December 18, 2019 |archive-date=December 18, 2019 |archive-url=https://web.archive.org/web/20191218142057/https://uproxx.com/tv/dennis-serial-killer-its-always-sunny-in-philadelphia/ |url-status=live }} In season 10, Dennis is diagnosed with borderline personality disorder, though it is not clear if the diagnosis was definitive, according to the actor. In the season 12 finale, Dennis reveals to the rest of the gang that he has an infant son, and moves to North Dakota to raise him.{{cite news |url=https://deadline.com/2018/06/its-always-sunny-in-philadelphia-glenn-howerton-dennis-fxx-return-date-1202418979/ |title=Paddy's At Capacity For Dennis? 'It's Always Sunny In Philadelphia' Returns With Character Out Of State |first=Greg |last=Evans |date=June 28, 2018 |work=Deadline |access-date=June 29, 2018 |archive-date=June 28, 2018 |archive-url=https://web.archive.org/web/20180628205822/https://deadline.com/2018/06/its-always-sunny-in-philadelphia-glenn-howerton-dennis-fxx-return-date-1202418979/ |url-status=live }} He inexplicably returns to Philadelphia in season 13, seeming to have abandoned his son. In later seasons, Dennis becomes preoccupied with his age and loss of general fitness and attractiveness, something the rest of The Gang is aware of and very much use to hurt him.
• Rob McElhenney as Ronald "Mac" McDonald, co-owner and self-proclaimed bouncer of Paddy's Pub.
  Mac is Charlie's childhood friend and Dennis's high school friend. The son of a convicted felon who has been in prison for much of Mac's life, he frequently attempts to demonstrate his toughness and refers to himself as the "sheriff of Paddy's". Deeply insecure about his masculinity and homosexuality, Mac constantly seeks the approval of those around him, especially his absent father, his apathetic mother, and his self-absorbed roommate Dennis. He suffers from extreme bouts of body dysmorphia, and has been depicted at various weights throughout the course of the series. Mac often brags about his hand-to-hand combat skills, but typically flees from physical confrontation and is usually depicted as the most cowardly of the gang. Mac is a Roman Catholic, though he often espouses strong Christian fundamentalist opinions, and his religion is regularly in conflict with his behavior and his homosexuality. It is insinuated for years that Mac is gay and harbors feelings for his best friend Dennis, though he remains in denial, much to the gang's annoyance, until he comes out in season 12.
• Kaitlin Olson as Deandra "Sweet Dee" Reynolds, waitress and sometimes bartender at Paddy's Pub, as well as Dennis's twin sister and Frank's daughter.
  Though initially depicted as The Gang's 'voice of reason' in a couple of episodes in the debut season, Dee quickly loses any sense of moral fortitude that she once had, and is shown to be just as prejudiced and depraved as her male colleagues by the end of season 1. Dee is frequently the subject of The Gang's casual misogyny, leading to nicknames like "bird" and "bitch", leading to her resenting them and plotting against them and others whom she deems more successful than herself. Like her brother, Dee too is deeply insecure, though unlike him, she was a disappointment to her parents and a social outcast since high school as a result of her back brace; so she craves approval from Dennis and Frank in any way. Though often the butt of the gang's jokes, she nevertheless stays involved with them because of her desperate need for attention. Unlike the men, Dee lives alone and does not hold any ownership stake in the bar – perhaps due to the gang's various prejudices against her — but also in part due to her desire to become a professional actress/comedian (an ambition she consistently fails to achieve because of her debilitating stage fright and her lack of any talent). Dennis and Dee are frequently shown to be two sides of the same coin, with later episodes depicting Dee engaging in predatory behavior towards young men.
• Danny DeVito as Frank Reynolds, the legal father of Dennis and Dee Reynolds, and the majority owner of Paddy's Pub soon after his introduction in season 2 onwards.
  Frank is a multi-millionaire who often funds and enables The Gang's worst schemes and impulses, just to feel a sense of youthfulness and energy. He was once a successful businessman with a long history of illegal operations, including running sweatshops in Vietnam, and dealings with sordid characters, but chooses to abandon that life and redeem himself after leaving his "whore wife", Barbara Reynolds. He has since embraced his "feral" nature and describes himself as "fringe class". Despite his substantial financial resources, he chooses to share a decrepit studio apartment with Charlie, where they sleep together on a pullout couch and have a surprisingly affectionate pseudo-father/son relationship. The two have similar interests, such as playing Night Crawlers, collecting trash, eating garbage and foraging naked in the sewers for coins. Frank always arms himself with at least one loaded handgun and does not hesitate to brandish or even discharge one when provoked, and often snorts cocaine as part of his daily routine. Whenever the Gang gets in trouble, Frank is happy to embrace his status as a multi-millionaire and bail them out of trouble, ensuring they never need to go to prison.

File:544 Mateo Street in Los Angeles.jpg

Charlie Day, Glenn Howerton, and Rob McElhenney first met each other while auditioning for Tuck Everlasting{{cite web |date=January 10, 2022 |title=1. The Gang Gets Racist |url=https://www.youtube.com/watch?v=h97oKaQSX-M |access-date=May 24, 2022 |work=The Always Sunny Podcast |language=en |via=YouTube}} and other projects in New York City and, later, in Los Angeles—they were going up for similar parts, moved to Los Angeles around the same time and even had the same manager Nick Frenkel.{{Cite web |date=September 12, 2011 |title=Episode 209 – Charlie Day and Glenn Howerton |url=http://www.wtfpod.com/podcast/episodes/episode_209_-_charlie_day_and_glenn_howerton |access-date=May 24, 2022 |website=WTF with Marc Maron |language=en-US}} Day and Howerton, notably, got to know each other on a car ride back from testing for That '80s Show in late 2001, when Howerton was cast as Corey Howard and Day did not get the part of his best friend.

While living in New York, Day had been making comedic home movies with his friends from the Williamstown Theatre Festival—Jimmi Simpson, Nate Mooney, David Hornsby and Logan Marshall-Green, (many of whom would later go on to be involved with Sunny)—which inspired McElhenney and Howerton to want to make short films of their own with him. McElhenney, in particular, had been writing screenplays between jobs and since none of them were picked up, decided to shoot them himself with Howerton, Day and other actor friends.{{Cite web |date=March 5, 2015 |title=Episode 582 – Rob McElhenney |url=http://www.wtfpod.com/podcast/episodes/episode_582_-_rob_mcelhenney1 |access-date=May 24, 2022 |website=WTF with Marc Maron |language=en-US}} The decision to make their own short films was further influenced by the release of the affordable Panasonic DVX100A digital camera as well as the accessible, low-budget look of The Office (UK) and Curb Your Enthusiasm.

It's Always Sunny in Philadelphia grew out of an idea for a short film conceived late one night by McElhenney "where a friend came over to another friend's house to get sugar, and the friend tells him he has cancer, and all the guy can think about is getting his sugar and getting out of there".{{cite web |last=Wyatt |first=Edward |date=September 9, 2007 |title=It's Always Sunny in Philadelphia – Television |url=https://www.nytimes.com/2007/09/09/arts/television/09wyat.html |url-access=subscription |url-status=live |archive-url=https://web.archive.org/web/20190611140255/https://www.nytimes.com/2007/09/09/arts/television/09wyat.html |archive-date=June 11, 2019 |access-date=June 9, 2019 |website=The New York Times}} He wrote the scene down before taking it to Howerton the next day to flesh it out and work on making it comedic. Day was soon roped in and the first script was written, featuring three struggling actors in LA named Charlie, Glenn and Mac, and the ensuing awkwardness around Charlie's cancer diagnosis. The home movies were shot and reshot multiple times, initially with Hornsby playing the Mac character and McElhenney behind the camera as director. It was via this process that McElhenney, Day and Howerton learned the basics of shooting, editing and other aspects of film-making.{{cite web |date=January 10, 2022 |title=4. Charlie Has Cancer |url=https://www.youtube.com/watch?v=ErF-Um18G0M |access-date=May 24, 2022 |work=The Always Sunny Podcast |language=en |via=YouTube}} The three then developed a second "episode" of their home movie series, this time focused on the humor from Mac's sense of shame around his relationship with Carmen, a transgender woman. At this point, it became clear that the home movies had potential as a television series, instead of the short films they were envisioned as originally. Both parts would eventually end up in the episode "Charlie Has Cancer".

The home movie was titled It's Always Sunny on TV after the a-ha song "The Sun Always Shines on T.V.". Howerton had been listening to the album Hunting High and Low (1985) while stretching at a Crunch gym in West Hollywood.{{cite web |date=January 10, 2022 |title=2. Charlie Wants An Abortion |url=https://www.youtube.com/watch?v=kL9gJmtanfs |access-date=May 24, 2022 |work=The Always Sunny Podcast |language=en |via=YouTube}} This was then developed into a pilot called It's Always Sunny on TV and was shot on a digital camcorder{{cite web |last=Blitz |first=Stefan |date=June 3, 2014 |title=The $85 TV Pilot: The Origins of IT'S ALWAYS SUNNY IN PHILADELPHIA |url=https://www.indigoprod.com/nyc-video-production-blog/2014/06/the-85-tv-pilot-the-origins-of-its-always-sunny-in-philadelphia/ |url-status=dead |archive-url=https://web.archive.org/web/20190428124948/https://www.indigoprod.com/nyc-video-production-blog/2014/06/the-85-tv-pilot-the-origins-of-its-always-sunny-in-philadelphia/ |archive-date=April 28, 2019 |access-date=June 9, 2019 |website=Indigo Productions}} and filmed in the actors' own apartments.{{cite news |last1=Andrews |first1=Travis M. |date=September 26, 2019 |title=Pop Culture In its record 14 seasons, 'It's Always Sunny in Philadelphia' has dodged cancel culture, controversy — and Emmys |newspaper=The Washington Post |url=https://www.washingtonpost.com/arts-entertainment/2019/09/26/its-record-seasons-its-always-sunny-philadelphia-has-dodged-cancel-culture-controversy-emmys/ |url-status=live |access-date=February 22, 2020 |archive-url=https://web.archive.org/web/20200222210126/https://www.washingtonpost.com/arts-entertainment/2019/09/26/its-record-seasons-its-always-sunny-philadelphia-has-dodged-cancel-culture-controversy-emmys/ |archive-date=February 22, 2020}} They expanded the central cast to four people living in Los Angeles, "a group of best friends who care so little for each other", Howerton said.

It was often claimed that the pilot was shot with a budget of just $200, but Day would later comment, "We shot it for nothing... I don't know where this $200 came from... We were a bunch of kids with cameras running around shooting each other and [the] next thing you know, we're eleven years in and we're still doing the show."{{cite web |date=January 20, 2016 |title=Charlie Day Isn't Sure FXX Knows 'Always Sunny' Is Still On |url=https://www.cbs.com/shows/the-late-show-with-stephen-colbert/video/A3CC776B-AAC2-3521-1043-5C8A463F6E40/charlie-day-isn-t-sure-fxx-knows-always-sunny-is-still-on/ |url-status=dead |archive-url=https://web.archive.org/web/20200802005718/https://www.cbs.com/shows/the-late-show-with-stephen-colbert/video/A3CC776B-AAC2-3521-1043-5C8A463F6E40/charlie-day-isn-t-sure-fxx-knows-always-sunny-is-still-on/ |archive-date=August 2, 2020 |access-date=June 9, 2019 |website=CBS}} This pilot was shopped by the actors around various studios, their pitch being simply showing the DVD of the pilot to executives.

After viewing the pilot, FX Network ordered the first season. The show was budgeted at $450,000 an episode, less than a third of a network standard, using Panasonic's DVX100 MiniDV prosumer video camera. The original concept had "the gang" being out-of-work actors with the theme song being a cha-cha version of "Hooray for Hollywood";{{cite magazine |last=Collis |first=Clark |date=September 16, 2010 |title='It's Always Sunny in Philadelphia' soundtrack: Star Charlie Day explains why listening to the show's music is like 'huffing paint through your ears' |url=https://ew.com/article/2010/09/16/its-always-sunny-in-philadelphia-soundtrack/ |url-status=live |magazine=Entertainment Weekly |archive-url=https://web.archive.org/web/20190421195445/https://ew.com/article/2010/09/16/its-always-sunny-in-philadelphia-soundtrack/ |archive-date=April 21, 2019 |access-date=June 9, 2019}} however there were too many shows at the time with a similar premise. "The network came to us and said, 'We don't want a show about actors,' and we said, 'Fine, let's put it somewhere else,{{' "}} McElhenney explained. "I'm from Philly, let's put it in Philly, and we'll make it about a bar, because that's a job where you can have lots of free time and still have income that could explain how these people can sustain themselves." The title was later changed to reflect that, in the unaired pilot, the gang had been rewritten as bar owners in Philadelphia, instead of actors in LA. Prior to Kaitlin Olson joining the show, the character Sweet Dee was going to be played by Jordan Reid, who at the time was the girlfriend of McElhenney. The part was recast after they broke up.{{cite web |last=Reid |first=Jordan |date=July 29, 2016 |title=The (Real) 'It's Always Sunny In Philadelphia' Origin Story |url=https://observer.com/2016/07/the-real-its-always-sunny-in-philadelphia-origin-story/ |url-status=live |archive-url=https://web.archive.org/web/20181105162206/https://observer.com/2016/07/the-real-its-always-sunny-in-philadelphia-origin-story/ |archive-date=November 5, 2018 |access-date=June 9, 2019 |website=Observer.com}}

After the first season, FX executives were worried about the show's low ratings and demanded that changes be made to the cast.{{cite web |last=Davis |first=Scott |date=March 11, 2015 |title=Here's how Danny DeVito saved 'It's Always Sunny in Philadelphia' from getting canceled |url=https://www.businessinsider.com/how-danny-devito-joined-its-always-sunny-in-philadelphia-2015-3 |url-status=live |archive-url=https://web.archive.org/web/20190723011855/https://www.businessinsider.com/how-danny-devito-joined-its-always-sunny-in-philadelphia-2015-3 |archive-date=July 23, 2019 |access-date=July 23, 2019 |website=Business Insider}} "So, John Landgraf, who's the president of FX, he called me in for a meeting and was like, 'Hey, no one's watching the show, but we love it,{{' "}} McElhenney recalled. {{" '}}We wanna keep it on, but we don't have any money for marketing, and we need to add somebody with some panache that we can hopefully parlay into some public relations story, just so we can get people talking.{{' "}} FX began suggesting actors such as Danny DeVito that could boost the show's profile. "It's not that we were reticent to the idea of adding Danny to the show," Howerton recalled, "It's that we were reticent to add a name to the show. You know, because we kinda liked that we were no-names and it was this weird, small thing, you know." Initially, McElhenney refused, saying "No, I just don't think we wanna do that, and they were like, 'Oh OK, well, you know... the show's over.{{' "}} Realizing they needed to change the trajectory of the show to please the network, McElhenney, Howerton, and Day became open to adding a new cast member who was familiar to the public. However, McElhenney, Howerton, and Day were hesitant at first since they thought they would "ruin the show", but during an interview, Day commented on how they got lucky with DeVito in the end: "We didn’t know what Danny would be like as a person. It turned out he was as great an actor as he was a person. As I said, we got lucky with Danny."{{cite web |url=https://www.filmmakingstuff.com/filmmaking-stuff-interview-with-charlie-day/ |title=How To Produce Hit Television Shows Like Charlie Day |website=Filmmaking Stuff |date=February 21, 2015 |first=Jason |last=Brubaker |access-date=July 24, 2022}} DeVito joined the cast in the first episode of the second season, playing the father of Dennis and Dee.

The show is shot in both Philadelphia and Los Angeles. The exterior of Paddy's Pub is located at the Starkman Building on 544 Mateo Street in Los Angeles.

Half of season 15 of the show takes place in Ireland. As the actors could not film there physically due to COVID-19 restrictions, a second unit shot B-roll in Ireland while locations in northern California were transformed with visual effects to resemble locations in Ireland.

On April 1, 2016, the series was renewed for a thirteenth and fourteenth season, which matched The Adventures of Ozzie and Harriet with the most seasons for a live-action sitcom in American television history.{{cite web|url=http://tvline.com/2016/04/01/its-always-sunny-renewed-season-13-14-fxx/|title=It's Always Sunny in Philadelphia Renewed for Seasons 13 and 14 at FXX|website=TVLine|last=Ausiello|first=Michael|date=April 1, 2016|access-date=April 1, 2016|archive-date=April 1, 2016|archive-url=https://web.archive.org/web/20160401225342/http://tvline.com/2016/04/01/its-always-sunny-renewed-season-13-14-fxx/|url-status=live}} In January 2023, McElhenney confirmed that filming for the sixteenth season had begun.{{cite web|url=https://www.avclub.com/rob-mcelhenney-season-16-its-always-sunny-started-filmi-1850038828|title=Rob McElhenney confirms filming has started on season 16 of It's Always Sunny|website=The A.V. Club|last=Hughes|first=William|date=January 26, 2023|access-date=January 26, 2023}} In May 2024, DeVito said that the eight-episode seventeenth season would begin filming in September 2024{{cite web |url=https://www.cracked.com/article_42199_danny-devito-says-its-always-sunny-in-philadelphia-season-17-will-be-going-again-in-september-and-the-first-16-were-too-tame.html |title=Danny DeVito Says 'It's Always Sunny in Philadelphia' Season 17 Will Be 'Going Again' in September, and the First 16 Were Too 'Tame' |website=Cracked |first=Keegan |last=Kelly |date=May 16, 2024 |access-date=June 25, 2024}} and shooting was confirmed to have finished in December 2024.{{cite web|url=https://www.yahoo.com/lifestyle/charlie-day-eager-challenge-filming-215500874.html|title=Charlie Day Was Eager For The Challenge Of Filming The 'It's Always Sunny in Philadelphia' / 'Abbott Elementary' Crossover Episodes: "It's Great Fodder for Comedy"|date=January 7, 2025|access-date=January 9, 2025|work=Yahoo|last=Sloop|first=Hope}}

{{Main|List of It's Always Sunny in Philadelphia episodes}}

{{:List of It's Always Sunny in Philadelphia episodes}}

The first season ran for seven episodes with the finale airing September 15, 2005. According to McElhenney,{{cite web |last=Goldman |first=Eric |date=June 28, 2006 |title=It's Always Sunny in Philadelphia Premiere |url=http://www.ign.com/articles/2006/06/28/its-always-sunny-in-philadelphia-premiere |url-status=live |archive-url=https://web.archive.org/web/20120915001907/http://www.ign.com/articles/2006/06/28/its-always-sunny-in-philadelphia-premiere |archive-date=September 15, 2012 |access-date=June 22, 2009 |website=IGN}} word of mouth on the show was good enough for FX to renew it for a second season, which ran from June 29 to August 17, 2006. Reruns of edited first-season episodes began airing on FX's then-parent network, Fox, in June 2006, for a planned three-episode run—"The Gang Finds a Dead Guy,"{{cite web |title=(SP-0635) "The Gang Finds a Dead Guy" (Repeat) |url=http://www.thefutoncritic.com/listings/20060519fox18/ |url-status=live |archive-url=https://archive.today/20140421005502/http://www.thefutoncritic.com/listings/20060519fox18/ |archive-date=April 21, 2014 |access-date=April 26, 2014 |website=The Futon Critic}} "Gun Fever" (which was renamed "Gun Control"){{cite web |title=(SP-0636) "Gun Control" (Repeat) |url=http://www.thefutoncritic.com/listings/20060526fox19/ |url-status=live |archive-url=https://archive.today/20130625172515/http://www.thefutoncritic.com/listings/20060526fox19/ |archive-date=June 25, 2013 |access-date=April 26, 2014 |website=The Futon Critic}} and "Charlie Gets Molested"{{cite web |title=(SP-0637) "Charlie Gets Molested" (Repeat) |url=http://www.thefutoncritic.com/listings/20060601fox25/ |url-status=live |archive-url=https://archive.today/20130625172528/http://www.thefutoncritic.com/listings/20060601fox25/ |archive-date=June 25, 2013 |access-date=April 26, 2014 |website=The Futon Critic}} were shown. The show was not aired on broadcast television again until 2011, when FX began offering it for syndication.{{cite web |url=https://www.tdogmedia.com/2011/05/warner-bros-sacks-curb-entourage-in-syndication-2.html |title=Warner Bros. Sacks "Curb", Entourage" in syndication |website=T Dog Media |date=May 14, 2011 |access-date=August 21, 2022}}

The third season ran from September 13 to November 15, 2007. On March 5, 2008, FX renewed It's Always Sunny in Philadelphia for a fourth season.{{cite magazine |url=http://insidetv.ew.com/2008/03/05/ew-exclusive-it/ |title='Always Sunny in Philadelphia' Gets Another Season |magazine=Entertainment Weekly |date=March 5, 2008 |access-date=March 5, 2008 |archive-date=August 15, 2011 |archive-url=https://web.archive.org/web/20110815220913/http://insidetv.ew.com/2008/03/05/ew-exclusive-it/ |url-status=live }} On July 15, 2008, it was reported that FX had ordered 39 additional episodes of the series, produced as seasons five through seven of the show. All five main cast members were secured for the entire scheduled run.{{cite web |last=Goldman |first=Eric |date=July 15, 2008 |title=FX Shows Love for It's Always Sunny |url=http://www.ign.com/articles/2008/07/15/fx-shows-love-for-its-always-sunny |url-status=live |archive-url=https://web.archive.org/web/20140219012229/http://www.ign.com/articles/2008/07/15/fx-shows-love-for-its-always-sunny |archive-date=February 19, 2014 |access-date=July 15, 2008 |website=IGN}} The fifth season ran from September 17 to December 10, 2009.{{cite web |title=It's Always Sunny in Philadelphia Season 5 episodes |url=http://www.tvguide.com/tvshows/its-always-sunny-in-philadelphia/episodes-season-5/191585 |url-status=live |archive-url=https://web.archive.org/web/20130526025237/http://www.tvguide.com/tvshows/its-always-sunny-in-philadelphia/episodes-season-5/191585 |archive-date=May 26, 2013 |access-date=April 9, 2013 |work=TV Guide}} On May 31, 2010, Comedy Central began airing reruns.{{cite web |url=http://tvbythenumbers.zap2it.com/2010/05/03/its-always-sunny-in-philadelphia-debuts-on-comedy-central-may-31/50337/ |archive-url=https://web.archive.org/web/20140102085941/http://tvbythenumbers.zap2it.com/2010/05/03/its-always-sunny-in-philadelphia-debuts-on-comedy-central-may-31/50337/ |url-status=dead |archive-date=January 2, 2014 |title='It's Always Sunny in Philadelphia' Debuts On Comedy Central May 31 |publisher=TV by the Numbers |first=Bill |last=Gorman |date=May 3, 2010 |access-date=April 26, 2014}} WGN America also began broadcasting the show as part of its fall 2011 schedule.{{cite web |url=http://brandedcontent.adage.com/cableguide2011/network.php?id=35 |title=Cable Guide 2011 |publisher=Advertising Age |access-date=April 9, 2013 |archive-url=https://web.archive.org/web/20130105170735/http://brandedcontent.adage.com/cableguide2011/network.php?id=35 |archive-date=January 5, 2013 |url-status=dead }}

The sixth season ran from September 16 to December 9, 2010, comprising 12 episodes, plus the Christmas special. The seventh season ran from September 15 to December 15, 2011, comprising 13 episodes. On August 6, 2011, FX announced it had picked up the show for an additional two seasons (the eighth and ninth) running through 2013.{{cite web |last=Mitovich |first=Matt Webb |date=August 6, 2011 |title=FX Renews Louie and Wilfred, Orders Two More Seasons of It's Always Sunny |url=http://www.tvline.com/2011/08/fx-renews-louie-wilfred-its-always-sunny/ |url-status=live |archive-url=https://web.archive.org/web/20120308054252/http://www.tvline.com/2011/08/fx-renews-louie-wilfred-its-always-sunny/ |archive-date=March 8, 2012 |access-date=April 26, 2014 |website=TVLine}} On March 28, 2013, FX renewed the show for a tenth season, and announced that it would move to FX's new sister network, FXX.{{cite web |url=http://www.huffingtonpost.com/2013/03/28/its-always-sunny-in-philadelphia-renewed_n_2971445.html |title='It's Always Sunny In Philadelphia' Renewed For Season 10 And 'The League' For Season 6 On FX |work=The Huffington Post |first=Jaimie |last=Etkin |date=March 28, 2013 |access-date=March 28, 2013 |archive-date=November 14, 2020 |archive-url=https://web.archive.org/web/20201114000913/https://www.huffpost.com/entry/its-always-sunny-in-philadelphia-renewed_n_2971445 |url-status=live }}

In April 2017, Kaitlin Olson announced that It's Always Sunny in Philadelphia would go on an extended hiatus. In an interview with TV Guide, she said, "We ended up pushing our next season a year because we were all busy with separate projects this year. So at the end of this coming shooting season of The Mick, I'll step right into Sunny after that."{{Cite web |last=Matthews |first=Liam |date=April 27, 2017 |title=It's Always Sunny in Philadelphia Season 13 Will Be a Year Late |url=http://www.tvguide.com/news/its-always-sunny-in-philadelphia-on-hiatus/ |url-status=live |archive-url=https://web.archive.org/web/20170606112202/http://www.tvguide.com/news/its-always-sunny-in-philadelphia-on-hiatus/ |archive-date=June 6, 2017 |access-date=June 8, 2017 |work=TV Guide}} On October 2, 2017, the show premiered on Vice on TV.{{cite web |date=September 30, 2017 |title=It's Always Sunny in Philadelphia on VICELAND – Begins Oct 2 |url=https://www.youtube.com/watch?v=mdvZGXIRC2k |url-status=live |archive-url=https://web.archive.org/web/20191109064704/https://www.youtube.com/watch?v=mdvZGXIRC2k&gl=US&hl=en |archive-date=November 9, 2019 |access-date=November 21, 2017 |publisher=Viceland |via=YouTube}}

The series is available for streaming on Hulu except for the episodes "America's Next Top Paddy's Billboard Model Contest", "Dee Reynolds: Shaping America's Youth", "The Gang Recycles Their Trash", "The Gang Makes Lethal Weapon 6" and "Dee Day", due to scenes involving blackface.{{cite web |url=https://www.vulture.com/2020/06/blackface-tv-episodes-scenes-removed-streaming.html |title=Every Blackface Episode and Scene That's Been Pulled From Streaming So Far |website=Vulture |first=Rebecca |last=Alter |date=June 29, 2020 |access-date=December 11, 2020}} The same episodes are missing from Netflix in the UK,{{cite web |url=https://www.digitalspy.com/tv/ustv/a32853800/netflix-it-s-always-sunny-episode-blackface/ |title=Netflix removes It's Always Sunny episode over blackface scenes |website=Digital Spy |first=Chris |last=Edwards |date=June 16, 2020 |access-date=July 20, 2021}} Disney+ in Australia, Canada, Scandinavia, and Spain, and Latin America.

{{Listen|type=music|filename=Temptation Sensation - Heinz Kiessling.ogg|left|title="Temptation Sensation"|description=Performed by Heinz Kiessling (30 seconds)}}

The show uses recurring orchestral production music selections. "We had a music supervisor called Ray Espinola and we said, 'Give us everything you have in a sort of Leave It to Beaver with a big band-swing kind of feel,' and the majority of the songs are from what he sent over," Charlie Day explained. "When you set it against what these characters were doing—which often times can be perceived as quite despicable, or wrong—it really disarmed the audience. It just became our go-to library of songs."

The theme song is called "Temptation Sensation" by German composer Heinz Kiessling. Kiessling's work ("On Your Bike" and "Blue Blood") can also be heard during various scene transitions throughout the show, along with other composers and pieces such as Werner Tautz ("Off Broadway"), Joe Brook ("Moonbeam Kiss"), and Karl Grell ("Honey Bunch"). Many of the tracks heard in the series are from Cafe Romantique, an album of easy listening production music collected by Extreme Music, the production music library unit of Sony/ATV Music Publishing.{{cite web |last=Heigl |first=Alex |date=April 1, 2015 |title=12 Songs Given Second Lives as Famous TV Show Themes |url=https://people.com/tv/existing-songs-used-as-tv-themes/ |url-status=live |archive-url=https://web.archive.org/web/20190515092309/https://people.com/tv/existing-songs-used-as-tv-themes/ |archive-date=May 15, 2019 |access-date=June 13, 2019 |website=People}} Independent record label Fervor Records has also contributed music to the show. Songs from The Jack Gray Orchestra's album Easy Listening Symph-O-Nette ("Take A Letter Miss Jones," "Golly Gee Whiz," and "Not a Care in the World") and the John Costello III release Giants of Jazz ("Birdcage," "Cotton Club" and "Quintessential") are heard in several episodes. The soundtrack, featuring most of the music heard on the show, was released in 2010.{{cite magazine |last=Barrett |first=Annie |date=August 26, 2010 |title='It's Always Sunny in Philadelphia' soundtrack to be released September 1: Ta-da, ta-da, ta-da-daah-daah-daah... |url=https://ew.com/article/2010/08/26/sunny-in-philadelphia-soundtrack/ |url-status=live |magazine=Entertainment Weekly |archive-url=https://web.archive.org/web/20111106075718/http://music-mix.ew.com/2010/08/26/sunny-in-philadelphia-soundtrack/ |archive-date=November 6, 2011 |access-date=October 7, 2011}}

{{Track listing

| headline = It's Always Sunny in Philadelphia (Music from the Original TV Series) track listing

| extra_column = Artist

| total_length = 50:05

| title1 = Temptation Sensation (Main Title Theme)

| music1 = Heinz Kiessling

| extra1 = The Heinz Kiessling Orchestra

| length1 = 2:53

| title2 = Derby Day

| music2 = Werner Tautz

| extra2 = The Heinz Kiessling Orchestra

| length2 = 2:39

| title3 = Blue Blood

| music3 = Heinz Kiessling

| extra3 = The Heinz Kiessling Orchestra

| length3 = 2:54

| title4 = On Your Bike

| music4 = Heinz Kiessling

| extra4 = The Heinz Kiessling Orchestra

| length4 = 2:15

| title5 = Take the Plunge

| music5 = Heinz Kiessling

| extra5 = The Heinz Kiessling Orchestra

| length5 = 3:10

| title6 = Hotsy-Totsy

| music6 = Heinz Kiessling

| extra6 = The Heinz Kiessling Orchestra

| length6 = 2:18

| title7 = Off Broadway

| music7 = Werner Tautz

| extra7 = The Heinz Kiessling Orchestra

| length7 = 2:31

| title8 = Coconut Shy

| music8 = Heinz Kiessling

| extra8 = The Diamontinos

| length8 = 2:25

| title9 = Honey Bunch

| music9 = Karl Grell

| extra9 = The Ralph Manning Orchestra

| length9 = 2:44

| title10 = Glitterati Party

| music10 = Werner Tautz

| extra10 = The Heinz Kiessling Orchestra

| length10 = 2:51

| title11 = Singles Soiree

| music11 = Richard Faecks

| extra11 = The Rüdiger Piesker Orchestra

| length11 = 2:09

| title12 = Pink Deville

| music12 = Paul Rothman

| extra12 = The Ole Olafsen Band

| length12 = 2:34

| title13 = Captain's Table

| music13 = Heinz Kiessling

| extra13 = The Heinz Kiessling Orchestra

| length13 = 2:44

| title14 = Starlet Express

| music14 = Werner Tautz

| extra14 = The Heinz Kiessling Orchestra

| length14 = 2:31

| title15 = Final Fling

| music15 = Heinz Kiessling

| extra15 = The Heinz Kiessling Orchestra

| length15 = 2:29

| title16 = Sweetheart Serenade

| music16 = Werner Tautz

| extra16 = The Heinz Kiessling Orchestra

| length16 = 2:54

| title17 = Tea at Tiffani's

| music17 = Werner Tautz

| extra17 = The Heinz Kiessling Orchestra

| length17 = 2:28

| title18 = Moonbeam Kiss

| music18 = Joe Brook

| extra18 = The Rüdiger Piesker Orchestra

| length18 = 2:21

| title19 = Grand Central

| music19 = Werner Tautz

| extra19 = The Heinz Kiessling Orchestra

| length19 = 3:15

}}

It's Always Sunny in Philadelphia has received critical acclaim for its humor and the performances of the cast. Emily Nussbaum of The New Yorker praised the show, calling it "not merely the best sitcom on television but one of the most arresting and ambitious current TV series, period".{{cite magazine |last=Nussbaum |first=Emily |date=November 11, 2013 |title=Bar None: "It's Always Sunny in Philadelphia" and "The Mindy Project" |magazine=The New Yorker |url=http://www.newyorker.com/magazine/2013/11/11/bar-none |url-status=live |access-date=December 5, 2015 |archive-url=https://web.archive.org/web/20151023063442/http://www.newyorker.com/magazine/2013/11/11/bar-none |archive-date=October 23, 2015}} Gillian Flynn of Entertainment Weekly reviewed the first season negatively, commenting, "[I]t is smug enough to think it's breaking ground, but not smart enough to know it isn't".{{cite magazine |last=Flynn |first=Gillian |date=August 2, 2005 |title=It's Always Sunny in Philadelphia |url=http://www.ew.com/ew/article/0,,1088891,00.html |url-status=dead |magazine=Entertainment Weekly |archive-url=https://web.archive.org/web/20101107040909/http://www.ew.com/ew/article/0,,1088891,00.html |archive-date=November 7, 2010 |access-date=August 16, 2010}} Brian Lowry of Variety gave the first season a positive review, saying it was "invariably clever and occasionally a laugh-out-loud riot, all while lampooning taboo topics".{{cite news |last=Lowry |first=Brian |date=July 31, 2005 |title=Review: 'It's Always Sunny in Philadelphia' |work=Variety |url=https://variety.com/2005/film/reviews/it-s-always-sunny-in-philadelphia-3-1200524154/ |url-status=live |access-date=August 16, 2010 |archive-url=https://web.archive.org/web/20140426234844/http://variety.com/2005/film/reviews/it-s-always-sunny-in-philadelphia-3-1200524154/ |archive-date=April 26, 2014}} However, later seasons of the show have received favorable ratings on review aggregator Metacritic, receiving 70/100, 78/100, and 85/100 for seasons 4, 5, and 6 respectively.{{cite web |url=http://www.metacritic.com/tv/its-always-sunny-in-philadelphia/ |publisher=Metacritic |title=It's Always Sunny in Philadelphia |access-date=April 26, 2014 |archive-date=April 24, 2014 |archive-url=https://web.archive.org/web/20140424033127/http://www.metacritic.com/tv/its-always-sunny-in-philadelphia |url-status=live }} The show has become a cult hit with viewers and is often compared in style to Seinfeld–particularly due to the self-centered nature of its main characters. The Philadelphia Inquirer reviewer Jonathan Storm wrote, "It's like Seinfeld on crack", a quote that became widely-used to describe the series,{{cite news |last=Storm |first=Jonathan |title=Slackers' revenge – The jokers of 'It's Always Sunny in Philadelphia' take on a (fictional) Inquirer critic, while those on Testees take the juvenile quotient even higher |work=The Philadelphia Inquirer |date=October 16, 2008 |page=E01}} to the point that FX attached the tagline, "It's Seinfeld on crack".{{cite web |last=Mellor |first=Louisa |date=April 12, 2012 |title=Why you need to watch It's Always Sunny In Philadelphia |url=http://www.denofgeek.com/tv/21146/why-you-need-to-watch-its-always-sunny-in-philadelphia |url-status=live |archive-url=https://web.archive.org/web/20140427010913/http://www.denofgeek.com/tv/21146/why-you-need-to-watch-its-always-sunny-in-philadelphia |archive-date=April 27, 2014 |access-date=April 26, 2014 |website=Den of Geek}}

In 2014, Entertainment Weekly listed the show at number 7 in the "26 Best Cult TV Shows Ever", with the comment that "it's a great underdog story ... If it sounds too dark for you, consider that there's an episode about making mittens for kittens, and it's adorable".{{cite magazine |date=March 17, 2014 |title=26 Best Cult TV Shows Ever |url=https://ew.com/gallery/26-best-cult-tv-shows-ever/?slide=380654#380654 |url-status=live |magazine=Entertainment Weekly |archive-url=https://web.archive.org/web/20190402144920/https://ew.com/gallery/26-best-cult-tv-shows-ever/?slide=380654#380654 |archive-date=April 2, 2019 |access-date=April 2, 2019}} In 2016, a New York Times study of the 50 TV shows with the most Facebook likes found that Sunny was "more popular in college towns (and most popular in Philadelphia)".{{Cite news |last=Katz |first=Josh |date=December 27, 2016 |title='Duck Dynasty' vs. 'Modern Family': 50 Maps of the U.S. Cultural Divide |newspaper=The New York Times |url=https://www.nytimes.com/interactive/2016/12/26/upshot/duck-dynasty-vs-modern-family-television-maps.html |url-status=live |access-date=December 28, 2016 |archive-url=https://archive.today/20170329083111/https://www.nytimes.com/interactive/2016/12/26/upshot/duck-dynasty-vs-modern-family-television-maps.html?_r=1 |archive-date=March 29, 2017}} In 2015, Rolling Stone rated the top 20 greatest and funniest It's Always Sunny in Philadelphia episodes, stating "for 10 seasons, the series had mined comic gold from the execrable behavior of the owners of Paddy's Pub". They claimed the two-part season 4 episode, "Mac and Charlie Die" is the sitcom's greatest episode yet.{{cite magazine |last=Murray |first=Noel |date=February 20, 2015 |title=20 Best 'It's Always Sunny in Philadelphia' Episodes |url=https://www.rollingstone.com/tv/lists/20-best-its-always-sunny-in-philadelphia-episodes-20150220 |url-status=live |magazine=Rolling Stone |archive-url=https://web.archive.org/web/20161220185133/http://www.rollingstone.com/tv/lists/20-best-its-always-sunny-in-philadelphia-episodes-20150220 |archive-date=December 20, 2016 |access-date=February 2, 2017}} In 2019, the BBC called the show "the best US sitcom". They praised the show's unique outlook and ability to range from nihilistic humor to genuine heartfelt moments.{{cite web |last=Woodhead |first=Hannah |date=September 24, 2019 |title=Why It's Always Sunny In Philadelphia Is The Best US Sitcom |url=https://www.bbc.com/culture/article/20190924-its-always-sunny-in-philadelphia-is-americas-best-sitcom |url-status=live |archive-url=https://web.archive.org/web/20191003043715/http://www.bbc.com/culture/story/20190924-its-always-sunny-in-philadelphia-is-americas-best-sitcom |archive-date=October 3, 2019 |access-date=October 6, 2019 |work=BBC}} According to Matt Fowler of IGN, the series "broke new ground" due to its sociopathic depiction of "The Gang". It was also ranked 63rd in IGN's list of the top 100 TV shows of all time.{{Cite web|last=Fowler|first=Matt|title=Top 100 TV Shows Of All Time {{!}} 63: It's Always Sunny in Philadelphia|url=https://www.ign.com/lists/top-100-tv-shows/63|access-date=March 9, 2021|website=IGN}}

In September 2009, the cast took their show live. The "Gang" performed the musical The Nightman Cometh in New York City, Boston, Seattle, San Francisco, Los Angeles, and Philadelphia.{{cite web |url=http://content.usatoday.com/communities/popcandy/post/2009/08/the-nightman-cometh-to-a-city-near-you/1 |title=The 'Nightman Cometh' to a city near you |work=USA Today |first=Whitney |last=Matheson |date=August 6, 2009 |access-date=October 7, 2011 |archive-date=January 1, 2013 |archive-url=https://web.archive.org/web/20130101062314/http://content.usatoday.com/communities/popcandy/post/2009/08/the-nightman-cometh-to-a-city-near-you/1 |url-status=live }} Mary Elizabeth Ellis and Artemis Pebdani also appeared in the performance as The Waitress and Artemis. Actress Rhea Perlman (wife of Danny DeVito) assumed the role of Gladys.{{cite web |first=Eric |last=Goldman |url=http://www.ign.com/articles/2009/04/20/its-always-sunny-in-philadelphia-live |title=It's Always Sunny in Philadelphia: Live! |publisher=IGN |date=April 20, 2009 |access-date=October 7, 2011 |archive-date=July 13, 2013 |archive-url=https://web.archive.org/web/20130713124625/http://www.ign.com/articles/2009/04/20/its-always-sunny-in-philadelphia-live |url-status=live }} Creator Rob McElhenney said that Live Nation originally approached the cast about doing the show at 30 cities, but in the end the cast settled on six.{{cite web |author=Tucker, Alyssa |url=http://www.flashfloodmedia.net/2009/08/04/rob-mcelhenney-glenn-howerton-interview/ |title=Rob McElhenney & Glenn Howerton Interview |publisher=Flash Flood Media |date=August 4, 2009 |access-date=April 26, 2014 |archive-date=November 14, 2020 |archive-url=https://web.archive.org/web/20201114000933/http://flashfloodmedia.net/ |url-status=live }} Co-developer Glenn Howerton described the show as "essentially an expanded version of the actual episode of "The Nightman Cometh," which was the final episode for season four. There are some added moments, added scenes, added songs, and extended versions of songs that already existed."{{cite web |url=http://www.iconvsicon.com/2009/09/16/glenn-howerton-interview-2009/ |title=Glenn Howerton Talks "It's Always Sunny In Philadelphia" And More! |publisher=Icon vs. Icon |date=September 16, 2009 |access-date=October 7, 2011 |archive-date=October 8, 2011 |archive-url=https://web.archive.org/web/20111008213745/http://www.iconvsicon.com/2009/09/16/glenn-howerton-interview-2009/ |url-status=live }} The performance featured two new songs, and the actors were given more opportunity to improvise thanks to the longer running time. An episode from season five was also previewed before the show. The Los Angeles performance, filmed at The Troubadour, was included as a bonus feature on the season four DVD box set.

A Russian adaptation of It's Always Sunny in Philadelphia premiered in Russia on the television channel TNT on May 12, 2014. This version is titled В Москве всегда солнечно (V Moskve vsegda solnechno, It's Always Sunny in Moscow) and like the original, centers around four friends, who own a bar called "Philadelphia" in Moscow.{{cite web |url=http://a-s-i-m.tnt-online.ru |script-title=ru:В Москве всегда солнечно |language=ru |publisher=THT-Online |access-date=May 4, 2014 |url-status=dead |archive-url=https://web.archive.org/web/20140504144313/http://a-s-i-m.tnt-online.ru/ |archive-date=May 4, 2014 }}{{cite web |last=White |first=Caitlin |title=The Russian Version of 'It's Always Sunny In Philadelphia' Looks Amazing |url=https://www.mtv.com/news/bqynz8/always-sunny-in-philadelphia-russian-version |website=MTV |access-date=October 20, 2023 |archive-url=https://web.archive.org/web/20221001021730/https://www.mtv.com/news/bqynz8/always-sunny-in-philadelphia-russian-version |archive-date=October 1, 2022 |url-status=dead |date=July 5, 2014}}

A book based upon It's Always Sunny in Philadelphia was released on January 6, 2015, titled The Gang Writes a Self-Help Book: The 7 Secrets of Awakening the Highly Effective Four-Hour Giant, Today.{{cite web |url=http://share.hc.com/book/9780062225115/Its-Always-Sunny-in-Philadelphia-by-The-Gang |title=It's Always Sunny in Philadelphia by The Gang |publisher=HarperCollins |access-date=July 23, 2014 |archive-url=https://web.archive.org/web/20170320122937/http://share.hc.com/book/9780062225115/Its-Always-Sunny-in-Philadelphia-by-The-Gang/ |archive-date=March 20, 2017 |url-status=dead }} In 2023, Laurel Randolph collaborated with Disney to release a cookbook inspired by the show's grotesque food, titled Paddy's Pub: The Worst Bar In Philadelphia: An It's Always Sunny In Philadelphia Cookbook.{{Cite web |title='It's Always Sunny' cookbook shares recipes for rum ham, milk steak |url=https://www.phillyvoice.com/its-always-sunny-cookbook-author-interview-rum-ham-milk-steak/ |first=Kristin |last=Hunt |date=September 8, 2023 |access-date=April 14, 2025 |website=PhillyVoice}} The cookbook was released on September 26, 2023, and features more than 45 recipes ranging from Charlie's Kelly's favorite dish, milk steak boiled over hard with jelly beans on the side to Frank Reynolds famous rum ham.{{Cite web |title=Paddy's Pub: The Worst Bar in Philadelphia by Laurel Randolph |url=https://www.penguinrandomhouse.com/books/730491/paddys-pub-the-worst-bar-in-philadelphia-by-laurel-randolph/ |access-date=April 14, 2025 |website=Penguin Random House}}

In November 2021, Howerton, Day, and McElhenney started The Always Sunny Podcast, an episode-by-episode rewatch podcast, with Megan Ganz as producer.{{cite web |url=https://bleedingcool.com/tv/the-always-sunny-podcast-our-episode-s01e01-thoughts-takeaways/ |title=The Always Sunny Podcast: Our Episode S01E01 Thoughts & Takeaways |website=Bleeding Cool |first=Ray |last=Flook |date=November 20, 2021 |access-date=January 14, 2025}} Occasional guest stars include Kaitlin Olson, David Hornsby, Mary Elizabeth Ellis, Michael Naughton, Lin-Manuel Miranda, Cormac Bluestone and Danny DeVito.{{Cite web|title=The Always Sunny Podcast|url=https://open.spotify.com/show/0xDEeqWuoMNBUFGNrhIz6L|access-date=December 3, 2021|website=Spotify}} The podcast performed their first live event at the Louisville festival Bourbon & Beyond in September 2022.{{cite web |url=https://www.spin.com/2022/09/the-always-sunny-podcast-live/ |title=The Always Sunny Podcast Throws a Rock'N'Roll Party at First Live Tapings |website=Spin (magazine)|first=Jonathan |last=Cohen |date=September 21, 2022 |access-date=January 14, 2025}} The podcast then began to go on tour in 2023, including live shows in New York City, Philadelphia, London and Dublin.{{cite web |url=https://www.brooklynvegan.com/the-always-sunny-podcast-announces-live-tapings-in-nyc-radio-city-and-philly/ |title='The Always Sunny' podcast announces live tapings in NYC (Radio City) and Philly |website=Brooklyn Vegan |first=Bill |last=Pearls |date=June 12, 2023 |access-date=January 14, 2025}}{{cite web |url=https://www.rollingstone.co.uk/tv/news/the-always-sunny-podcast-set-london-dublin-live-shows-26697/ |title='The Always Sunny Podcast' set for London and Dublin live shows |website=Rolling Stone UK |first=Joe |last=Goggins |date=February 13, 2023 |access-date=January 14, 2025}} In July 2023, the podcast was put on indefinite hold,{{cite web |url=https://www.phillyvoice.com/always-sunny-podcast-on-hold-actors-strike-writers-philadelphia/ |title='The Always Sunny Podcast' put on hold amid actors, writers strikes |website=Philly Voice |first=Michael |last=Tanenbaum |date=July 18, 2023 |access-date=January 14, 2025}} and Howerton confirmed its end in July 2024.{{cite web |url=https://www.cracked.com/article_42906_glenn-howerton-confirms-that-the-always-sunny-podcast-just-sort-of-ended.html |title=Glenn Howerton Confirms That 'The Always Sunny Podcast' Just Sort of Ended |website=Cracked |first=Keegan |last=Kelly |date=July 18, 2024 |access-date=January 14, 2025}}

In October 2024, it was announced that a two-episode crossover event with Abbott Elementary would begin as the ninth episode of the fourth season of Abbott Elementary, and conclude in the seventeenth season of It's Always Sunny in Philadelphia.{{Cite web |last=Garner |first=Glenn |date=October 17, 2024 |title='Abbott Elementary' & 'It's Always Sunny' Casts Fully Unite In Crossover Photo |url=https://deadline.com/2024/10/abbott-elementary-its-always-sunny-casts-unite-crossover-photo-1236119778/ |access-date=November 8, 2024 |website=Deadline}} The Abbott episode, "Volunteers", aired on January 8, 2025.{{Cite web |last=Shafiq |first=Saman |title='Abbott Elementary,' 'It's Always Sunny' crossover episode: Release date, time, cast |url=https://www.usatoday.com/story/entertainment/tv/2025/01/02/abbott-elementary-always-sunny-crossover/77401699007/ |access-date=January 14, 2025 |website=USA TODAY |language=en-US}}

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